16. Which of the following statements about ammonia molecules is not
true?

they possess a lone pair
the H-N-H bond is 107°
they are pyramidal in shape
they are tetrahedral in shape

17. Which of the following statements about SO2 molecules
is true?

the O=S=O bond angle is 180°
their shape is based on then having two lone pairs and
two double bond pairs
their shape is based on then having one lone pair and
two bond bond pairs
they are trigonal planar

18. Which of following best describes the shape of SO3
molecules?

linear
square planar
tetrahedral
trigonal planar

19. In which of the following changes are the bond angles in the
second species smaller than the first?